linux-kernel - Re: [PATCH v2] thermal: cpu_cooling: Remove usage of devm functions

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Message-ID: <20150826130921.GB10956@e104805>
Date:	Wed, 26 Aug 2015 14:09:21 +0100
From:	Javi Merino <javi.merino@....com>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	Vaishali Thakkar <vthakkar1994@...il.com>,
	Zhang Rui <rui.zhang@...el.com>,
	Eduardo Valentin <edubezval@...il.com>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] thermal: cpu_cooling: Remove usage of devm functions

On Wed, Aug 26, 2015 at 01:51:58PM +0100, Viresh Kumar wrote:
> On 26-08-15, 13:47, Javi Merino wrote:
> > I missed this because I wasn't CCed :(  Thankfully, I'll be in
> > MAINTAINERS for this soon.
> 
> Yeah, I need to resend that patch soon :)
> 
> > > -		devm_kfree(&cdev->device, load_cpu);
> > 
> > This introduces a memory leak.  Keep the kfree() here, you can't drop
> > it.  Cheers,
> > Javi
> > 
> > > -	}
> > > -
> > >  	*power = static_power + dynamic_power;
> > >  	return 0;
> > > +
> > > +free:
> > > +	kfree(load_cpu);
> 
> Wouldn't this make that work ?

Nope, you're not reaching that code path from there.  Removing the
"return 0" would work, but I don't like it, since we would be calling
kfree() all the time, even when the trace is not enabled.  I'd rather
leave the kfree() where it is.

Cheers,
Javi
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